Facetious adjective – Given to or marked by mature intelligent humor. Silly and facetious are semantically related. In some cases you can use "Silly" instead an adjective "Facetious". Nearby Word: facetiously
Then Michael Bowman of the Homestuck music team covered them, giving them both a facetious satirical Stylistic Suck treatment almost dripping in cheese and irony, emphasising just how incredibly silly they are.